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Precipitous rise in digital electronics, microprocessors and power electronics based devices has increased the concerns of quality the transmission and distribution systems. Unified power quality conditioner (UPQC) is the most advanced device to improve the power quality at PCC. UPQC is the integration of shunt and series active filters and is able to compensate for almost all kinds of voltage and...
Processes requiring a variable applied voltage often use power electronic devices. This causes reduced power factor and higher levels of current harmonic injection. Although power quality issues are typically rendered after the fact, by careful consideration during the design phase, equipment and/or processes can often be designed to achieve a better performance. This paper deals with methods for...
This work relates to the solution of reactive power problem in a line-commutated HVDC link. A series injection strategy has been formulated and the effects have been simulated indicating a significant reduction in reactive power consumption of the link. This would reduce the weight and volume of the capacitance required which is usually employed in such links thereby reducing the overall weight and...
This work attempts to explain reactive power consumption in a line commutated HVDC transmission system and suggests a possible solution to reduce it. A series injection strategy has been formulated using voltage-source converters and the effects have been simulated indicating a significant reduction in reactive power consumption by the converter terminal and consequently that supplied by the source...
A cycloconverter is a power electronic device used to produce adjustable voltage adjustable frequency AC power from a constant voltage constant frequency AC source without any DC link. Cycloconverters produce significant harmonics, sub-harmonics and non-standard frequency components in their output voltages. However harmonic behavior of cycloconverters widely depends of their pulse number, structure...
Three-phase thyristor rectifiers have been used in industries for obtaining a variable dc voltage, but they have a problem of including large lower-order harmonics in the input currents. For high-power applications, a 12-pulse configuration is useful for reducing the harmonics, but it still includes the (12 m plusmn1)th (m: integer) harmonics. In order to further reduce the harmonics, this paper proposes...
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